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Old 06-21-2013, 06:12 PM   #1
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What kind of gears?

How do I know what kind of gears my rig has? New to Jeeps and have no clue. I did a search but couldn't find anything.

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Old 06-21-2013, 06:16 PM   #2
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Look on your build sheet to know for sure. If you don't have it you can find it on Chrysler's website. If you have a Rubicon you have 4.10. If you have sport or Sahara you have either 3.21 or 3.73

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Old 06-21-2013, 06:29 PM   #3
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I have a 2008 Unlimited X 6 speed man trans
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Old 06-21-2013, 06:41 PM   #4
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Originally Posted by epreza50 View Post
I have a 2008 Unlimited X 6 speed man trans

Not enough info. If you don't have the window sticker or the build sheet, you can request a build sheet from Chrysler for your VIN:


http://www.jeep.com/wccsapp/universal/J/index.jsp


...which should be accurate if you bought the Jeep new. If you bought it used, there is a chance that the previous owner re-geared...but if they had, they probably would have advertised that fact since it's usually a selling point.
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Old 06-21-2013, 06:46 PM   #5
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Thank you I will call the dealer. I purchased used at a dealer about month & 1/2 ago
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Old 06-21-2013, 07:10 PM   #6
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Place in nuetral. Jack up the rear. Jack stands and chocks of course.
Mark the rear tire and drive shaft. Rotate tire 10 times.
Count DS rotations. 32 = 3.21:1, 37 = 3.73:1, 41 = 4.10:1
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Old 06-21-2013, 07:38 PM   #7
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Mine is '08 man it HAD 3.21 in it.
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Old 06-21-2013, 07:51 PM   #8
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Quote:
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Place in nuetral. Jack up the rear. Jack stands and chocks of course.
Mark the rear tire and drive shaft. Rotate tire 10 times.
Count DS rotations. 32 = 3.21:1, 37 = 3.73:1, 41 = 4.10:1
After looking up the same thing this seems to be the BEST and most accurate method without actually opening up the diff.
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Old 06-21-2013, 07:56 PM   #9
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Quote:
Originally Posted by Tumbleweed View Post
Place in nuetral. Jack up the rear. Jack stands and chocks of course.
Mark the rear tire and drive shaft. Rotate tire 10 times.
Count DS rotations. 32 = 3.21:1, 37 = 3.73:1, 41 = 4.10:1
I may be wrong here but doesn't a drive shaft turn half as many revolutions as the wheel in a track lock diff as opposed to a fully locked diff?
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Old 06-21-2013, 08:56 PM   #10
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https://www.moparownerconnect.com/oc...nersLogin.aspx

go here, create an account, type in your VIN and you'll have access to your build sheet, which will tell you your jeep's gear ratio when it left the factory.

I suspect you have 3.21
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Old 06-21-2013, 09:21 PM   #11
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Quote:
Originally Posted by JKralph View Post
https://www.moparownerconnect.com/oc...nersLogin.aspx

go here, create an account, type in your VIN and you'll have access to your build sheet, which will tell you your jeep's gear ratio when it left the factory.

I suspect you have 3.21
A quick question. I have ordered my Jeep yesterday, how long before I can get a VIN and who sends that to me? (The dealer or Jeep themselves?) And when do I know that Jeep has confirmed my order?

Thanks!
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Old 06-21-2013, 09:25 PM   #12
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That's a good question, i bought mine used so i can't say for sure. i imagine you'd get that info from the dealer you ordered the jeep through; maybe someone who's also ordered one can say for sure
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Old 06-21-2013, 09:26 PM   #13
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And I too suspect that you have 3.21 as to get the 3.73 it is an option unless you ordered the Rubicon.
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Old 06-21-2013, 11:11 PM   #14
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I was so glad to see that I have 3.73 gearing on my 2012 Wrangler Sport S.
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Old 06-21-2013, 11:53 PM   #15
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I just requested my build sheet from Chrysler to find my gear ratios. Very easy to do and got my response in 2 days. I have a JKU 11 with 3.73 gears
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Old 06-22-2013, 12:58 AM   #16
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I have 3.21, thank you all
Probably not a good idea to run 35's right?
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Old 06-22-2013, 03:23 AM   #17
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I have 3.21, thank you all
Probably not a good idea to run 35's right?
Its not that bad if you have the 3.6. I'm running 315's with 3.21's for the time being. Its definitely drive able.
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Old 06-22-2013, 09:32 AM   #18
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I have a 3.8l engine
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Old 06-22-2013, 01:26 PM   #19
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I have a buddy running 37's in his 11 with 3.21's. its not for the faint of heart.

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